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Title : Sharpest Picture Of A Dust Disc Around An Elderly Star Snapped
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Sharpest Picture Of A Dust Disc Around An Elderly Star Snapped

id = " The European Southern Observatory (ESO) has obtained the increasingly acute disk image of an old star, which allows researchers to better understand this mysterious phase in the life of a star. The team, led by Michel Hillen and Hans Van Winckel of Instituut voor Sterrenkunde , was able to break the double IRAS 08544-4431 old star located about 4,000 light years from Earth in the constellation Vela. The first image reveals a well-defined ring extending away from the two stars, one of which is believed to be a red giant. Similar disks are seen in young star systems, which eventually give rise to the planets. But astronomers were not sure how or why they form around older stars. It is possible that the material is blown from the outer layers of the star and can actually lead to a second generation of planets. The study of this new system could provide some answers. "We were also surprised to find a glimmer that probably comes from a small accretion disc around the companion star," she said lead author Michel Hillen said in a statement . "We knew that the star was double, but did not expect to see directly companion. It is really thanks to the increase in performance that now offer the new detector in PIONIER , which are able to see very distant hinterlands of this system. " the astronomers used the Chile-based Very Large Telescope Interferometer make the discovery, a system that allows scientists to combine the light obtained from the four 8.2-meter (27-foot ) telescopes and four 1.8 meters (6 feet) auxiliary telescopes into a single image. "By combining the light from several telescopes Very Large Telescope Interferometer , an image of impressive sharpness is obtained - equivalent to a telescope with a diameter of 150 meters [490 feet] would, "added team member Jacques Kluska. "The resolution is so high that, by comparison, could determine the size and shape of a one euro coin seen from a distance of 2,000 kilometers [1,240 miles]." Stars lose a significant amount of mass as they go through the red giant phase. The material is pushed out and sculpted by stellar winds, forming disks that resemble those planets around young stars are formed. There are very few old stars nearby with a disc of this type, so this observation will allow researchers to better understand the differences between the disc formed at the beginning and end of the stellar cycle. "Our observations and models open a new window for studying the physics of these disks and stellar evolution in double stars," concluded Van Winckel. "For the first time the complex interactions between close binary systems and dusty environments can now be solved in space and time."
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